/*!
 * jquery.event.drag.live - v 2.2
 * Copyright (c) 2010 Three Dub Media - http://threedubmedia.com
 * Open Source MIT License - http://threedubmedia.com/code/license
 */
// Created: 2010-06-07
// Updated: 2012-05-21
// REQUIRES: jquery 1.7.x, event.drag 2.2

;(function( $ ){

// local refs (increase compression)
var $event = $.event,
// ref the special event config
drag = $event.special.drag,
// old drag event add method
origadd = drag.add,
// old drag event teradown method
origteardown = drag.teardown;

// allow events to bubble for delegation
drag.noBubble = false;

// the namespace for internal live events
drag.livekey = "livedrag";

// new drop event add method
drag.add = function( obj ){
  // call the old method
  origadd.apply( this, arguments );
  // read the data
  var data = $.data( this, drag.datakey );
  // bind the live "draginit" delegator
  if ( !data.live && obj.selector ){
    data.live = true;
    $event.add( this, "draginit."+ drag.livekey, drag.delegate );
  }
};

// new drop event teardown method
drag.teardown = function(){
  // call the old method
  origteardown.apply( this, arguments );
  // read the data
  var data = $.data( this, drag.datakey ) || {};
  // bind the live "draginit" delegator
  if ( data.live ){
    // remove the "live" delegation
    $event.remove( this, "draginit."+ drag.livekey, drag.delegate );
    data.live = false;
  }
};

// identify potential delegate elements
drag.delegate = function( event ){
  // local refs
  var elems = [], target,
  // element event structure
  events = $.data( this, "events" ) || {};
  // query live events
  $.each( events || [], function( key, arr ){
    // no event type matches
    if ( key.indexOf("drag") !== 0 )
      return;
    $.each( arr || [], function( i, obj ){
      // locate the element to delegate
      target = $( event.target ).closest( obj.selector, event.currentTarget )[0];
      // no element found
      if ( !target )
        return;
      // add an event handler
      $event.add( target, obj.origType+'.'+drag.livekey, obj.origHandler || obj.handler, obj.data );
      // remember new elements
      if ( $.inArray( target, elems ) < 0 )
        elems.push( target );
    });
  });
  // if there are no elements, break
  if ( !elems.length )
    return false;
  // return the matched results, and clenup when complete
  return $( elems ).bind("dragend."+ drag.livekey, function(){
    $event.remove( this, "."+ drag.livekey ); // cleanup delegation
  });
};

})( jQuery );